As a minimum standard for the documentation and interpretation of the investigation results, Table 3.1 is recommended (you can also find this table as online material for download). This voice investigation protocol is a systematic protocol that contains only evidence-based, quantifiable, and valid measurement parameters with thresholds for physiological and pathological assessment according to the current state of research. Each included measurement parameter should also have the potential to evaluate the success of a voice treatment for the individual voice patient in a targeted manner (primary critical measurement parameter).